Concept
Chord force
2 essays name this object, across 2 fields. What follows is each of them, and the objects they name alongside it.
Answering one question without solving the rest
A truss of fifty members can be interrogated about one of them. Cut through three, take moments about the point where two of them meet, and the third falls out in a single line.
Depth is the cheapest strength there is
Doubling the depth of a truss halves its chord forces without adding a gram of material to the chords. Nothing else in structural design is that cheap, and almost every structure has already spent it.
Named alongside it
The objects these essays reach for when they reach for this one.
Lever armBucklingEfficiencyFree body diagramMethod of sectionsMoment centreMoment equilibriumPanel shearSecond moment of areaSelf weightSpan to depth ratio